399013 has 4 divisors (see below), whose sum is σ = 400608. Its totient is φ = 397420.

The previous prime is 398989. The next prime is 399023. The reversal of 399013 is 310993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310993 = 353 ⋅881.

It is a cyclic number.

It is not a de Polignac number, because 399013 - 2¹³ = 390821 is a prime.

It is a super-2 number, since 2×399013² = 318422748338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331 + ... + 952.

It is an arithmetic number, because the mean of its divisors is an integer number (100152).

2³⁹⁹⁰¹³ is an apocalyptic number.

It is an amenable number.

399013 is a deficient number, since it is larger than the sum of its proper divisors (1595).

399013 is a wasteful number, since it uses less digits than its factorization.

399013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 399013 is about 631.6747580836. The cubic root of 399013 is about 73.6199777408.

The spelling of 399013 in words is "three hundred ninety-nine thousand, thirteen".